Add integration test for creator holders endpoint returning 404 for non-existent creator

[Chucks1093]

Summary

Calling GET /creators/:id/holders with a creator ID that does not exist should return 404 with a clear error body, not an empty list. This case needs an explicit integration test.

Scope

• Call the holders endpoint with a creator ID that is not in the database
• Assert response status is 404
• Assert response body contains a descriptive error message

Acceptance Criteria

• Returns 404 for unknown creator ID
• Response body contains a descriptive error message
• Does not return 200 with empty array

ETA: 12 hours

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Coordinate on Telegram

[binayyub4211]

@binayyub4211 has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hey maintainer,
Kindly assign me to work on this issue,
Thank u

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[anoncon]

@anoncon has applied to work on this issue as part of the Stellar Wave Program's 6th wave.

Hi
I’d like to work on this issue if it’s available. I’m a full-stack Web2 & Web3 developer with solid open-source experience and can start working on it right away.

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